[R] survey weights

[A Das]

Thanks, Thomas.
    Yes, that's exactly what happened: the warnings
came first after "data(China)", and then after
"dchina<-svydesign..." So the design object isn't
being produced? The dataset is very large, and the
weights were already set in Stata before importing.
Would either of those cause problems?
                           -Bobby
                                                      
                             

--- Thomas Lumley <tlumley at u.washington.edu> wrote:

> On Sat, 3 Sep 2005, A Das wrote:
> 
> > Hi all, I've been trying to get a large (12mb)
> Stata
> > survey database into R. I managed that, but when I
> > attach survey weights, something goes wrong. The
> error
> > message is: object dchina not found. Here's the
> > script:
> 
> If that is the *first* message then something
> extremly strange is 
> happening
> 
> > library(car)
> > library(foreign)
> > library(survey)
> >
> > China <- read.dta("C:/final07c2.dta")
> > attach(China)
> 
> This attach() isn't necessary or helpful
> 
> > data(China)
> You should get a warning here
> 
> Warning message:
> data set 'China' not found in: data(China)
> 
> since China isn't one of the built-in data sets. If
> you don't get this 
> message it suggests that you do have a built-in
> dataset called China, 
> which will have overwritten your file.
> 
> >
>
dchina<-svydesign(id=~psu,strata=~strata,weights=~weight0x,
>                           data=China,nest=TRUE)
> 
> If this line doesn't produce an error message then a
> variable called 
> "dchina" must have been produced, in which case you
> shouldn't get an error 
> message saying it wasn't found in the next line.
> 
> > summary(dchina)
> >
> 
> 
> Are you sure there wasn't an earlier error message
> from the call to 
> svydesign()?
> 
>  	-thomas
>